#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;
const int MOD = (int)1e9;

vector<vector<int>> get_combination(int ma) {
    vector<vector<int>> mat(ma + 1, vector<int>(ma + 1));
    for (int n = 0; n <= ma; n++) mat[n][0] = 1;
    for (int n = 1; n <= ma; n++) for (int r = 1; r <= n; r++) {
        mat[n][r] = mat[n - 1][r - 1] + mat[n - 1][r] % MOD;
    }
    return mat;
}

int main() {
    vector<vector<int>> comb = get_combination(10000);
    int n, m; cin >> n >> m;
    cout << comb[m][n / 1000 % m] % MOD << endl;
    return 0;
}